Guard Channel based Call Admission Control Schemes in Hierarchical Mobile IPv6 Networks

Call Admission Control (CAC) strategies are required to guarantee all service types meet their quality of service (QoS) requirements in wireless broadband mobile networks. Although much research focuses on modified Mobile IP to get better efficient performance, there are few papers to discuss admission control when considering handover and mobility management. CAC should be introduced to Mobile IP-based network to guarantee the QoS for users. In this paper, we extend Hierarchical Mobile IPv6 (HMIPv6) Binding Update message to support CAC schemes. According to the simulation results, it was evident that these CAC schemes can reduce the probability of the handoff dropping and the cell overload and limit the probability of the new call blocking. The method can provide QoS in Mobile IPv6 networks with few modifications on MAP functionality and slight change in binding update (BU) message formats. In future work, we will enhance the threshold adjustment procedure so that our CAC schemes can accommodate themselves to the drastic changes of mobility patterns in mobile networks.